This most successful informal reading inventory has been adapted to meet the strong demand for K-12 teachers to assess Spanish-speaking students in their native tongue. Since it can assess a student's reading competency in Spanish as well as English, this inventory is particularly valuable considering the influx of English as a Second Language (ESL) students and Spanish-speaking students in the public schools. Taking a constructivist approach, the authors combine both traditional and holistic methods to determine a student's reading level. This pragmatic, well-designed inventory can be used in undergraduate/graduate courses dealing with reading remediation, in public schools with Latino populations, and in ESL teacher training programs.